Determine Vertical Shifts - Trigonometry

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Question

Let be a function defined as follows:

The 4 in the function above affects what attribute of the graph of ?

Answer

The period of the function is indicated by the coefficient in front of ; here the period is unchanged.

The amplitude of the function is given by the coefficient in front of the ; here the amplitude is -1.

The phase shift is given by the value being added or subtracted inside the function; here the shift is units to the right.

The only unexamined attribute of the graph is the vertical shift, so 4 is the vertical shift of the graph. A vertical shift of 4 means that the entire graph of the function will be moved up four units (in the positive y-direction).

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Question

Let be a function defined as follows:

What is the vertical shift in this function?

Answer

The period of the function is indicated by the coefficient in front of ; here the period is unchanged.

The amplitude of the function is given by the coefficient in front of the ; here the amplitude is 3.

The phase shift is given by the value being added or subtracted inside the cosine function; here the shift is units to the right.

The only unexamined attribute of the graph is the vertical shift, so -3 is the vertical shift of the graph. A vertical shift of -3 means that the entire graph of the function will be moved down three units (in the negative y-direction).

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Question

This graph shows a translated cosine function. Which of the following could be the equation of this graph?

Screen shot 2020 08 07 at 3.33.42 pm

Answer

The correct answer is . There are no sign changes with vertical shifts; in other words, when the function includes , it directly translates to moving up three units. If you thought the answer was , you may have spotted the y-intercept at and jumped to this answer. However, recall that the y-intercept of a regular function is at the point . Beginning at and ending at corresponds to a vertical shift of 3 units.

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Question

The graph below shows a translated sine function. Which of the following functions could be shown by this graph?

Screen shot 2020 08 07 at 3.48.45 pm

Answer

A normal graph has its y-intercept at . This graph has its y-intercept at . Therefore, the graph was shifted down three units. Therefore the function of this graph is .

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Question

Consider the function . What is the vertical shift of this function?

Answer

The general form for the secant transformation equation is . represents the phase shift of the function. When considering we see that , so our vertical shift is and we would shift this function units up from the original secant function’s graph.

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Question

Which of the following is the graph of with a vertical shift of ?

Answer

The graph of with a vertical shift of is shown below. This can also be expressed as .

Secx  3

Here is a graph that shows both and , so that you can see the "before" and "after." The original function is in blue and the translated function is in purple.

Screen shot 2020 08 09 at 1.35.24 pm

The graphs of the incorrect answer choices are (no vertical shift applied), (shifted upwards instead of downwards), (amplitude modified, and shifted upwards instead of downwards), and (shifted downwards 3 units, but this is not the correct original graph of simply since the amplitude was modified.)

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Question

Which of the following graphs shows one of the original six trigonometric functions with a vertical shift of applied?

Answer

We are looking for an answer choice that has one of the six trigonometric functions, as well as that function shifted up 3 units. The only answer choice that displays that is this graph of (purple) and (blue).

Screen shot 2020 08 09 at 1.42.07 pm

The incorrect answers depict and , and , and and .

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